NuAire MEV-M Installation And Maintenance Manual

MEV-M units
Continuous Mechanical Extract
Ventilation Units
Fig. 1.
General view of unit.
NOTE:
THIS UNIT IS DELIVERED WITH THE BLOWER
SECTION PACKED 'LOOSE' INSIDE THE CASE
FOR FIXING SEE PAGE 2

Introduction

NuAire's MEV-M units are designed to be installed into duct-
work above the area to be ventilated (usually in the ceiling void).
The units provide mechanical extract ventilation for homes in
accordance with BRE digest 398. Single, twin and dual fan units
are available
The case is constructed in galvanised steel. Internal faces of the
casing are acoustically lined. The full length access cover is
retained by four screws. An integral fixing bracket with a single
screw fixing allows easy mounting and removal of the unit when
necessary. The unit is delivered with the 200mm dia discharge
spigot fitted.
Various 'knockout' inlet spigot positions can be utilised. All inlet
spigots are 'closed' as knockouts when delivered. A full kit of
inlet spigots with integral balancing dampers is supplied bagged
separately.
The inlet spigot locations are as follows:
One x 150mm end knockout.
Two x 100mm knockouts on LH side of case.
Two x 100mm knockouts on RH side of case.
Any, or all, of these inlets can be utilised. User removes the
knockout(s ) and fits the balancing spigot(s) supplied.
A filter frame with a replaceable filter is 'push fit' located inside
the case which is easily removed for cleaning following removal
of the case cover.
The fan is designed to be wired direct to the mains supply
through a fused spur isolator (by others) and run continuously in
the NORMAL mode (which is the low speed or trickle ventila-
tion setting). The degree of extract from each room served can be
adjusted with the inlet balancing spigots.
The unit is provided with adjustment for the trickle (low speed
or NORMAL) and high speed (BOOST) ventilation as standard.
The NORMAL speed adjustment has a range of 0% to 50%.
The unit is delivered with the NORMAL speed adjustment set to
0%. Note: the NORMAL speed must be set to 25% by the
installer.
An adjustment of 50 -100% is provided for the 'BOOST' duty
setting to reduce performance if necessary.
Installation
and Maintenance
NuAire Home Ventilation
Western Industrial Estate Caerphilly,
CF83 1XH United Kingdom.
Telephone: 08705 002555
Facsimile: 08705 002666
Email: info@nuaire.co.uk
www.nuaire.co.uk
Contents
Introduction
Codes
Dimensions
Installation
Adjustments
Installing / Removing the blowers
Optional Fault Indication
Electrical data
Wiring Diagrams
Certification
Maintenance
Spares & Service
IMPORT ANT WARNING
Installation and servicing MUST be carried out
by electrically quaIified personnel.
The unit MUST BE TOTALLY ISOLATED from the
electrical supply before removing covers.
NOTE internal input socket will be exposed and
MAY BE LIVE with the fan module removed.
See 'ISOLATION' notes.
The unit is delivered with the BOOST speed adjustment set to
100%. (See the adjustments information on page 3). A manual
remote switch is provided to activate the NORMAL and BOOST
functions (see fig. 2).
Provision is also made for the wiring in of an optional remote fail
indicator (not supplied). Order item HVCT-AVI.
Coding
MEV-M Single fan unit
MEV-2M Twin fan unit (with auto duty sharing)
MEV- M+ Dual fan unit (both fans continuous running)
Duty
Units are available with one or two fans and with the following
duties:
100 l/s (MEV-M & MEV-2M)
The MEV-M has a single fan and delivers 100 l/s
The MEV-2M has two fans and delivers 100 l/s with automatic
duty sharing to extend unit operational life. Also the unit will
switch to the 'standby' fan in the event of a fan failure.
150 l/s (MEV-M+).
The MEV-M+ has two fans which run continuously and deliver
150 l/s. In the event that one fan fails, the other will still deliver
100 litres as a single fan until the unit is serviced.
Leaflet 671123
JULY 2001
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